JPWO2002097837A1 - Member for push button switch and method of manufacturing the same - Google Patents

Member for push button switch and method of manufacturing the same Download PDF

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Publication number
JPWO2002097837A1
JPWO2002097837A1 JP2003500928A JP2003500928A JPWO2002097837A1 JP WO2002097837 A1 JPWO2002097837 A1 JP WO2002097837A1 JP 2003500928 A JP2003500928 A JP 2003500928A JP 2003500928 A JP2003500928 A JP 2003500928A JP WO2002097837 A1 JPWO2002097837 A1 JP WO2002097837A1
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JP
Japan
Prior art keywords
push button
member
button switch
key top
transparent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2003500928A
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Japanese (ja)
Inventor
川口 利行
利行 川口
堀田 真司
真司 堀田
高橋 正幸
正幸 高橋
Original Assignee
信越ポリマー株式会社
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Filing date
Publication date
Priority to JP2001156730A priority Critical patent/JP2002352657A/en
Priority to JP2001156730 priority
Application filed by 信越ポリマー株式会社 filed Critical 信越ポリマー株式会社
Priority to PCT/JP2002/004028 priority patent/WO2002097837A1/en
Publication of JPWO2002097837A1 publication Critical patent/JPWO2002097837A1/en
Application status is Granted legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/18Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks
    • H01H9/182Illumination of the symbols or distinguishing marks
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/12Light sources with substantially two-dimensional radiating surfaces
    • H05B33/26Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • H05B33/28Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode of translucent electrodes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20Making multilayered or multicoloured articles
    • B29C43/203Making multilayered articles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02Details
    • H01H13/12Movable parts; Contacts mounted thereon
    • H01H13/14Operating parts, e.g. push-button
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H2001/0005Redundant contact pairs in one switch for safety reasons
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/18Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks
    • H01H2009/186Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks using an electroluminiscent panel
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00Connections
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00Connections
    • H01H2207/002Conductive rubber; Zebra
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00Legends
    • H01H2219/002Legends replaceable; adaptable
    • H01H2219/018Electroluminescent panel
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00Legends
    • H01H2219/028Printed information
    • H01H2219/03Printed information in transparent keyboard
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00Legends
    • H01H2219/028Printed information
    • H01H2219/034Coloured areas
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49002Electrical device making
    • Y10T29/49105Switch making

Abstract

By using light energy for the illumination of the display unit without waste, it is possible to achieve illumination of the display unit with reduced brightness while maintaining low power consumption, and a thin and light push button switch member (1) with high visibility. An object of the present invention is to provide a key top (3), a key base (3), a cover substrate for disposing the key top (3) at a predetermined position and mounting the key top (3) on a circuit board (5), In a member (1) for a push button switch having a surface light emitter (4) integrated with a display part (2) for displaying a switch function provided in the part (3), the surface light emitter (4) is connected to a base electrode (14). It has a luminous layer (13) formed between the transparent electrode (10) facing the base electrode (14), and the transparent electrode (10) provided in contact with the display section (2) is made of a transparent conductive polymer. did.

Description

Technical field
The present invention relates to a member for a push button switch having a display unit for displaying a switch function in an input device such as a portable terminal such as a mobile phone, a PDA, a car stereo, an on-board board computer, an audio device, a measuring instrument, and a personal computer. More specifically, the present invention relates to an illuminated push-button switch member that can illuminate a display unit in a dark place and a method of manufacturing the same.
Background art
2. Description of the Related Art Conventionally, a member for a push button switch used in an input device of this type has been required to have a so-called character illumination function of illuminating a display unit showing the function of the push button switch during use at night.
For example, in a push button switch 30 used for an input device such as a mobile phone, as shown in FIG. 18 or FIG. 19, a cover base material 32 integrally formed with a plurality of key top portions 31 constituting operation keys. The switch function of the push button switch 30 can be realized by being incorporated in a housing of a target input device in a state where the and the circuit board 33 face each other. And, in order to understand the function of the push button switch 30 even in a dark place, on the top surface or the back surface of the key top portion 31 serving as each operation key, a display such as a character, a code or a pattern according to each switch function is displayed. Provided on the circuit board 33, a direct light emitted from a light source such as an LED 35 or a light bulb 36 provided on the circuit board 33, and a reflected light generated by reflecting the direct light on peripheral members are formed on the key top portion 31. Is transmitted from the back surface portion to the top surface portion, so that the display content of the display section 34 emerges and can be visually recognized. Thereby, a mobile phone or the like can be used without any trouble even at night.
When a more uniform brightness is required, a light guide member 37 on a thin plate is inserted between the LED 35 and the key top portion 31 as shown in FIG. Attempts have been made to increase the emission surface area by using an EL (electroluminescence) sheet 38 that emits surface light as a light source.
However, the light sources such as the LED 35, the light bulb 36, and the EL sheet 38 and the light guide member 37 that guides the direct light from the light source do not hinder the contact operation between the contact portion 39 on the circuit board 33 and the key top portion 31. As described above, since the light sources 35, 36, and 38 and the light guide member 37 and the display unit 34 are located apart from each other, the number of the LEDs 35 and the light bulbs 36 is increased, In the case where the light guide member 37 is supplemented or an expensive EL sheet 38 is used, the display contents of the display unit 34 are displayed in a dark place, although the design difficulty due to the increase in the number of parts is increased. In some cases, it was not possible to supply a sufficient amount of light to confirm the above, and its effectiveness was poor.
In particular, low power consumption is demanded for a battery-powered mobile phone, and it is desired to secure a sufficient amount of light with a small number of light sources. There is a contradiction that only a part can contribute to the improvement of the visibility of the display unit 34, and the visibility cannot be improved even if large power consumption is used.
Further, since the light sources 35, 36, 38 and the light guide member 37 are provided between the key top portion 31 and the corresponding contact portion 39 provided on the fixed substrate 33, the thickness of the push button switch 30 cannot be reduced. Thus, the thickness of the input device and the main body of the device are reduced, and the weight is increased.
Therefore, in order to solve the above-mentioned problems, as described in Japanese Patent Application Laid-Open Publication No. Hei 11-232954 or 2000-285760, a surface light emitting device which emits light by itself on the top surface of the key top unit is disclosed. There is known a device in which a body is provided and a light source is attached in the vicinity of a display unit to prevent light diffusion and loss of light amount due to obstacles.
These surface illuminators have a transparent conductive layer formed on a transparent insulating film by forming a ceramic layer of tin oxide, indium tin oxide, antimony tin oxide, or the like by an ion sputtering method, or a ceramic powder dispersed and mixed in a transparent insulating resin. The transparent conductive ink is formed by screen printing or the like.
However, in the case where the transparent conductive layer is formed of a ceramic layer by an ion sputtering method of tin oxide or the like, since the ceramic layer itself is brittle and hardly expands, it is necessary to stretch the transparent insulating film as a base material into a desired key top shape. However, there is a disadvantage that the transparent conductive layer cannot follow the shape, and the resistance rapidly increases. A transparent conductive layer formed by printing with a transparent conductive ink in which ceramic powder is dispersed and mixed in a transparent insulating resin is a mechanism for securing conductivity by a chain of powders. The resistance value is not so low and it is difficult to uniformly disperse the powder, and when trying to stretch the base transparent insulating film to the desired key top shape, the ceramic powder chain of the transparent electric layer is easy This leads to an increase in the resistance value, which causes uneven brightness.
Therefore, the present invention has been conceived in order to solve the problem of the above-described member for a push button switch that illuminates the display section of the conventional key top section, and illuminates the display section without wasting light energy. It is an object of the present invention to provide a push button switch member which has high luminance, is thin, and has high visibility, and can realize illumination of a display unit with high luminance efficiency while suppressing power consumption while maintaining power consumption.
Disclosure of the invention
In order to solve the above-mentioned problem, a first aspect of the present invention provides a key top portion for pressing a movable contact disposed opposite to a fixed contact on a circuit board in a direction in which the movable contact comes into contact with the fixed contact. A cover base for arranging the unit in a predetermined position and mounting on the circuit board, and a member for a push button switch having a surface light emitter integrated with a display unit for displaying a switch function on the key top unit. The surface light-emitting body has a light-emitting layer between a base electrode and a transparent electrode facing the base electrode, and the transparent electrode provided in contact with the display unit is a transparent conductive polymer. Features.
Thus, the visibility of the key top portion is greatly improved because the display portion itself emits light.
Further, since the amount of the luminous body layer of the surface luminous body can be limited to only the key top portion, the manufacturing cost can be reduced and the power consumption used for illumination can be suppressed. Furthermore, since there is no need to provide a light source or a light guide member between the key top portion and the corresponding contact portion provided on the fixed substrate, it is possible to provide a thin push button switch member. Thus, the input device and the device main body incorporating the push button switch member can be made thin.
According to a second aspect, in addition to the configuration of the first aspect, the transparent electrode has a surface resistance of 10 Ω / □ or more and a light transmittance of 90% or less.
Thereby, power consumption can be reduced while maintaining transparency and stretchability.
A third invention is characterized in that, in addition to the constitution of the first or second invention, the transparent electrode contains conductive fibers having a wire diameter of 0.5 μm or less and an aspect ratio of 20 or more.
Thereby, the transparency and the conductivity are maintained even when a tensile force due to drawing is applied, so that the reliability of the switch function is further improved in addition to the effect of any one of the first to third aspects.
A fourth invention is characterized in that, in addition to any one of the first to third inventions, the transparent electrode is colored.
Accordingly, the number of members constituting the display unit can be reduced, so that the manufacturing cost can be further reduced.
The fifth invention is characterized in that, in addition to any one of the first to fourth inventions, the transparent conductive polymer is made of any one of polypyrrole, polythiophene and polyaniline.
Since the transparent conductive polymer material has high stability to oxygen and humidity, is transparent and has high conductivity, the visibility of the key top portion and the reliability of the switch function are further improved.
According to a sixth aspect of the invention, in addition to the configuration of the first to fifth aspects, an extensible conductor is connected to the base electrode and the transparent electrode, and a tensile force acts at least at the time of molding the conductor. It is characterized in that the stretched portion is covered with a stretchable insulating thin film.
As a result, the insulating thin film regulates the flow of the material of the conductor connected to the base electrode, so that an increase in the resistance value of the base electrode can be suppressed, and a display unit that emits light uniformly can be obtained. In addition, a small luminous body layer is provided close to the display unit, so that it has good visibility in terms of design despite low power consumption, and because it does not require other extra parts and members, it is light, thin, short and small. It is possible to provide a member for a push button switch that provides excellent economic efficiency.
The seventh invention is characterized in that, in addition to the constitution of the sixth invention, a conductor connected to the base electrode and a conductor connected to the transparent electrode are arranged so as not to overlap in a plan view. .
Thereby, when used as a finished product after molding or during molding, the base electrode and the transparent electrode do not come into contact with each other and are not damaged or broken, and stable illumination can be obtained.
According to an eighth aspect, in addition to the constitution of the sixth or seventh aspect, the storage elastic modulus at the molding temperature of the material of the insulating thin film is different from the molding temperature of the conductor connected to the base electrode and the conductor connected to the transparent electrode. Is characterized by being larger than the storage modulus.
Thereby, in molding the key top shape, the moldability is further improved.
According to a ninth aspect, in addition to the configuration according to any one of the sixth to eighth aspects, the base electrode and the conductor connected to the base electrode include a conductive layer having an organic polymer and a conductive filler; The length of at least one side of the filler is substantially 1/3 or less of the thickness of the conductive layer.
Thereby, since the entanglement between the conductive fillers is maintained even after the molding, the conductive performance can be more reliably ensured.
According to a tenth aspect, in addition to the configuration of the ninth aspect, a conductive polymer layer is added to the conductive layer.
Thereby, the conductive performance can be further guaranteed.
According to an eleventh aspect, in addition to the configuration of the ninth or tenth aspect, the conductive filler is a fibrous material having a wire diameter of 1 μm or less.
Thereby, the conductive filler can be easily oriented at the time of molding, so that the required conductivity can be maintained even if the stretching is excessively performed to exceed 200%.
According to a twelfth aspect, in addition to the configuration of the sixth to eleventh aspects, the base electrode and the conductor connected to the base electrode are made of a conductive polymer.
Thereby, an excessive increase in resistance due to stretching is unlikely to occur, and the yield of the molding process is easily stabilized.
According to a thirteenth aspect, in addition to the configuration according to any one of the first to twelfth aspects, the key top portion has a key top main body having a desired key top shape on a back surface of the base electrode. On the back surface of the top body, there is provided a pressing projection for bringing the movable contact into contact with the fixed contact.
As a result, the pressing protrusion surely brings the movable contact into contact with the fixed contact, thereby increasing the reliability of the switch function.
According to a fourteenth aspect, in addition to the configuration according to any one of the first to twelfth aspects, the key-top portion is formed of a transparent material having a desired key-top shape on a surface of the transparent electrode via a transparent insulating film. And a second resin molded body having a first resin molded body and a pressing projection for contacting the movable contact with the fixed contact on the back surface of the base electrode.
As a result, the pressing protrusion surely brings the movable contact into contact with the fixed contact, thereby increasing the reliability of the switch function.
According to a fifteenth invention, in addition to the configuration according to any one of the first to twelfth inventions, a plurality of switch circuits each including a plurality of the key tops, and the base electrode and the transparent electrode corresponding to the plurality of the key tops. Are formed integrally with the cover base material.
Thereby, the plurality of key tops are uniformly illuminated brightly, so that when applied to an electric / electronic device requiring a plurality of key tops, such as a mobile phone, the design and usability are further improved.
A sixteenth invention is the method for manufacturing a member for a push button switch according to any one of the first to fifteenth inventions, wherein a transparent insulating film having the transparent electrode formed on one surface thereof is drawn. When a desired key top shape is formed, a stretchable conductive polymer is used at least for the transparent electrode of the stretched portion where a tensile force acts during drawing.
As a result, a conductive defect due to the molding process does not occur, so that there is no defect due to a conductive defect at the side surface of the key top portion, and the manufacturing efficiency is improved.
A seventeenth invention is characterized in that, in addition to the structure of the sixteenth invention, at least the extending portion of the transparent electrode before drawing is formed thick.
Thereby, the conductivity at the extending portion of the transparent electrode due to the molding process is maintained, so that the poor conductivity at the bent portion of the transparent electrode is eliminated, and the production efficiency is improved.
An eighteenth invention is the method for manufacturing a member for a push button switch according to any one of the sixth to fifteenth inventions, wherein the key top portion is formed on one surface of a transparent insulating film covering an outer surface of the key top portion. A transparent electrode is formed at a location corresponding to, a light emitting layer is formed on the transparent electrode, a base electrode is formed on the light emitting layer, and a stretchable conductor connected to the base electrode and the transparent electrode Forming a printed sheet before drawing, and forming the desired key-top shape by drawing the printed sheet, wherein a tensile force is applied during drawing. Is characterized in that a part of the stretched portion is coated with a stretchable insulating thin film.
As a result, the insulating thin film regulates the flow of the material of the conductor connected to the base electrode, so that an increase in the resistance value of the base electrode can be suppressed, and a display unit that emits light uniformly can be obtained. In addition, a small luminous body layer is provided close to the display unit, so that it has good visibility in terms of design despite low power consumption, and because it does not require other extra parts and members, it is light, thin, short and small. It is possible to provide a method of manufacturing a member for a push button switch that provides excellent economic efficiency.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment of the Invention]
FIG. 1 is a sectional view of a main part showing a member for a push button switch according to Embodiment 1 of the present invention.
The push-button switch member 1 according to the first embodiment shown in FIG. 1 is provided with a display unit 2 displaying a switch function using characters, codes, designs, or the like on a top surface side of a key top unit 3. , The display unit 2 employs a surface light emitter 4 which emits light by itself.
The member 1 for a push button switch according to the first embodiment is provided with a movable contact 7 that is arranged to face the fixed contact 6 on the circuit board 5. More specifically, a movable contact 7 is formed at the tip of a pressing projection 8 provided at the center of the rear surface of the key top portion 3, and the movable contact 7 is fixed to the fixed contact by pressing the key top portion 3 toward the circuit board 5. 6 can be contacted.
A plurality of key tops 3 arranged at predetermined positions on the outer periphery of the key tops 3 and between the push button switch member 1 and the circuit board 5 are covered with a cover material made of an elastic material such as silicone rubber. (Not shown), a part of the cover base material is elastically deformed toward the circuit board 5 when the key top portion 3 is pressed, and the cover base is released when the key top portion 3 is released. The key top portion 3 can be returned to the original position by the elastic restoring force of the material.
The material of the key top body 16 that determines the substantial shape of the key top portion 3 is selected from a hard or soft resin or an elastomer. The material may be thermoplastic or thermosetting, and is not limited to a material such as a film, a pellet, and a liquid. However, a liquid thermosetting resin is preferable because it can be easily poured.
A transparent insulating film 9 is coated on the outer peripheral surface of the key top portion 3 excluding the back surface portion, and the back surface of the transparent insulating film 9 extends from the side surface of the key top portion 3 to the top surface of the key top portion 3. The transparent electrode 10 which is one electrode of the surface light emitter 4 is provided within the reach. An opaque colored layer 11 having a light-shielding property and an insulating property is provided on the back surface of the transparent electrode 10 and on the back surface of the transparent insulating film 9 on which the transparent electrode 10 is not provided. The opaque colored layer 11 is formed with a blanking portion 12 that matches the shape of the display portion 2 such as characters, codes, and designs. On the back surface of the opaque colored layer 11, a light emitting layer 13 having a size slightly smaller than the size of the top surface of the key top portion 3 including the punching portion 12 is provided. Therefore, the die portion 12 is filled with the luminous body layer 13 to form a pattern portion such as a character, a code, a pattern, or the like, and the pattern portion and the ground portion formed of the opaque colored layer 11 around the die portion 12 are used. The design of the display unit 2 is completed. Then, on the back surface of the light emitting layer 13, a base electrode 14 for forming the other electrode is provided.
The transparent insulating film 9 on the outer surface of the key top portion 3 has a thickness of about 25 to 500 μm such as polyvinyl alcohol, polyethylene, polyethylene terephthalate, polyethylene naphthalate, polyacryl, polycarbonate, polystyrene, polyfluoroethylene propylene, and polychlorotrifluoro. Modification of ethylene, polyvinylidene, polyimide, polyamideimide, polyether sulfone, polysulfone, polyphenylene sulfide, polyamide, polyarylate, or thermoplastic elastomers such as styrene, polyester, polyamide, etc., and their copolymers, alloys, etc. In addition to products, multi-layer products obtained by laminating several types of films can be used. Here, a resin having a softening point of 50 to 200 ° C. or less, preferably 100 to 150 ° C. or less, which facilitates formation of a key top shape, is preferable, and a resin having a small gas permeability is desirable. Forming an inorganic oxide such as silicon oxide or aluminum oxide on the outside as a gas barrier layer by a vapor deposition method, a sol-gel method, or the like after molding is preferable for protecting the light emitting layer 13 and extending the life.
The conductive polymer used for the transparent electrode 10 includes polyacetylene, polyparaphenylene, polypyrrole, polythiophene, polyaniline, polyphenylenevinylene, polyselenophene, polyazulene, polypyrene, polycarbazole, polypyridazine, polynaphthylene, polyfluorene, and their alkylation and Polyethylene dioxythiophene, polythienylenevinylene, poly (3-methylthiophene), poly (3,4-dimethylthiophene), poly (3-thiophene-β-ethanesulfoner) into which a substituent such as alkoxylation is introduced, Polymethylpyrrole, poly (3-hexylpyrrole), poly (methyl 3-methyl-4-pyrrolecarboxylate), polycyanophenylenevinylene, polydimethoxyphenylenevinylene derivative, or polyisoprene Conjugated conductive polymer modified product, and the like.
Of these, derivatives of polypyrrole, polythiophene, and polyaniline, which have high stability to oxygen and humidity, are transparent, and have high conductivity, are preferred, although they are affected by the dopant. When used for an organic EL, a derivative of polyaniline or polythiophene having a high work function as an anode is preferable.
The conductive polymer is rigid and poor in adhesiveness because its skeleton is a conjugated double bond. Therefore, in order to obtain sufficient adhesion to the substrate, it is preferable to add an anchor coat having high polarity, such as polyurethane, polyamide, polyacrylamide, an amino group, a hydroxyl group, a nitrile group, a carboxyl group, and a cyano group. And the like having a polymer in the side chain.
In addition, since a conductive polymer alone cannot obtain a sufficient resistance value, it is necessary to dope, and halogen such as iodine or bromine, PF 5 , AsF 5 , BF 3 Lewis acids such as HF, HCl, H 2 SO 4 Organic acids such as protonic acids such as para-toluenesulfonic acid, para-methoxyethyltoluenesulfonic acid, FeCl 3 , TiCl 4 And organic substances such as tetracyanodimethane, tetracyanotetraazanaphthalene, and chloranyl, and donors such as alkali metals such as Li, Na, and K; and alkali metal earths such as Ca, Sr, and Ba. Can be
Care must be taken in de-doping in order to increase stability due to humidity and temperature, and it is better to avoid electrolyte anions and cations. Coordination bonds and copolymerization with conductive polymers are effective methods for fixing. . In particular, a dopant is introduced into an oligomer, a polymer or a fullerene molecule such as a dendrimer, polystyrene, polymethyl methacrylate, or polyurethane synthesized by combining an AB2-type monomer as a starting material and sequentially bonding from a central core molecule, and supporting the compound as a functional group. This is particularly preferable because it is simple and the adhesion to the transparent insulating film 9 is enhanced. Further, such a multifunctional dopant centered on the carrier is very useful because it conductively bridges between conductive polymer molecules, stabilizes the polymer, and lowers the resistance. Since the effect of undoping is very small when the conductive polymer is sealed, it is preferable that the conductive polymer is contained in a molded body. Further, in order to reduce the conductivity, it is useful to stretch the conductive polymer and reduce the intermolecular distance of the conductive polymer, and the stretching during molding can be used.
At the time of drawing, since a portion corresponding to the side surface of the key top portion 3 (stretched portion) is stretched by applying a tensile force, the transparent insulating film 9 and the transparent electrode 10 must be made of a material suitable for this. And those that are less likely to break or increase in resistance are selected. Conductive polymers are suitable materials for this. Although the specific resistance of the conductive polymer does not change by molding, the thickness is physically reduced and the resistance increases due to stretching. Therefore, the conductive polymer around the pattern portion (stretched portion) of the display unit 2 having a high stretch ratio is formed thick, and the absolute value of the resistance value can be suppressed. When the ground portion of the display unit 2 or the side surface of the key top unit 3 is opaque, it can be supplemented with conductive ink described later.
When the stretching is excessively performed to exceed 100%, the resistance may increase. In this case, the conductivity can be maintained by mixing fine conductive fibers having a wire diameter of 0.5 μm or less with the conductive polymer. If the wire diameter exceeds 0.5 μm, it becomes substantially invisible and the fiber becomes rigid, which hinders molding. The aspect ratio is preferably 10 or more, preferably 20 or more, and more preferably 50 or more. From the viewpoint of printability, the length is preferably 0.1 mm or less.
Further, when excessive stretching such as more than 200% is performed, if fine conductive fibers having a wire diameter of 1 μm or less are mixed with the conductive polymer, they can be oriented at the time of molding to maintain conductivity.
Examples of the conductive fiber include those obtained by tearing carbon fibers such as polyacrylonitrile, and those obtained by subjecting ceramic whiskers such as zinc oxide and potassium titanate to carbon coating or silver plating, and the like. Synthetic fibers such as acryl, rayon, polyester, phenol, etc. are subjected to silver plating or the like, or single-wall nanotubes, multi-wall nanotubes, and the like. Nanotubes are conductive fibers having a wire diameter of 0.2 μm or less, which are very convenient. Is good. The compounding amount is determined by a desired resistance value, and is 0.1 to 20% by weight. It goes without saying that the smaller the diameter and the smaller the blending amount, the higher the transparency.
The conductive polymer is obtained by a chemical polymerization method in which the precursor monomer is polymerized using an oxidizing agent or a catalyst, a method in which an intermediate made of a non-conjugated polymer is heat-treated, or an electrochemical oxidation of an aromatic compound as a monomer. Alternatively, there is an electrolytic polymerization method of performing polymerization by reduction, but the present invention is not limited thereto.
On the transparent insulating film 9, a conductive polymer low molecular weight product can be formed by vapor deposition or the like, or can be formed in a state of being dissolved or dispersed in water or a solvent or dispersed in an emulsion state by a general printing application method. The film thickness is about 0.1 to 25 μm. In the case of a conductive polymer, the film thickness and the resistance are often non-ohmic, and even if the thickness is increased, the resistance may not be reduced correspondingly, and the light transmittance is only deteriorated. Therefore, it is necessary to determine the required thickness in advance.
The surface resistance of the transparent electrode 10 is 10 Ω / □ or more, preferably 100 Ω / □ or more, and the light transmittance is 90% or less, preferably 80% or less. The surface resistance and the light transmittance have the opposite relationship. If the surface resistance is less than 10Ω / □, the amount of the dopant increases, the coloring becomes strong, and the desired color cannot be obtained. Hardens and does not show sufficient elongation. The higher the light transmittance, the better, but if it exceeds 90%, the surface resistance increases too much and the power consumption increases.
The structure in which the luminous body layer 13 of the surface luminous body 4 emits light may use the mechanism of electric-light conversion, and when the region of the display unit 2 is uniformly illuminated and combined with a resin molded body, Organic inorganic EL, organic EL, LEC (Light Emitting Electrochemical Cell), etc., which directly emit visible light, and those which emit outside visible light, for example, ultraviolet light, are converted into visible light. Etc. are included. Each of these requires an opposing electrode for power supply, but in the first embodiment, one electrode is a transparent electrode 10 which is transparent, and the other is a base electrode 14.
In the inorganic EL, a light emitting layer 13 having a thickness of about 5 to 50 μm is provided between two electrodes at least one of which is transparent to emit light by applying an alternating current of 20 to 100 V, 50 to 400 Hz or the like. In the case of a DC battery of a portable device or the like, it is necessary to boost the voltage by an inverter or the like and convert it to AC.
The luminous body layer 13 is obtained by dispersing an inorganic phosphor powder such as zinc sulfide in a high dielectric organic binder such as cyanoethyl cellulose, cyanoethyl saccharose, and cyanoethyl pullulan, forming a solution with acetonitrile, dimethylformamide, dimethylacetamide, and the like, followed by wet processing. Can be applied. In particular, the phosphor is doped with a metal such as copper or iron to achieve multicolor. In addition, the fluorescent material can be microencapsulated with ceramics by plasma polymerization, a sol-gel method, or another existing method, and the stability such as moisture resistance and adhesion to a substrate can be improved. In addition, the electric field efficiency can be increased by an excitation reflection layer or the like in which a high dielectric substance such as barium titanate or potassium titanate is further added to the binder.
In order to adhere well to the transparent electrode 10 made of a conductive polymer having low adhesiveness, it is preferable to use a material equivalent to the above-described anchor coat material.
As a light emitting material of the light emitting layer 13, a phosphor powder obtained by doping zinc sulfide with copper or the like may be used as a ferroelectric binder such as cyanoethyl cellulose, cyanoethyl saccharose, or cyanoethyl pullulan. Examples thereof include an ink dissolved in a polar solvent such as acetonitrile, and a toluene solution in which an electron transporting dye such as a trishydroxyquinolinolaluminum complex is mixed with a hole transporting binder such as polyvinyl carbazole.
The inorganic EL sheet has been conventionally used as a planar light source, but in the present invention, since it is used only for the display unit 2, its area is about 1/5 to 1/100 that of a conventional backlight. Is small, and the power consumption can be reduced in proportion thereto.
The organic EL is classified into a low molecular weight type and a high molecular weight type depending on the luminescent material used. Among them, the polymer type having a large film thickness is easy to process. In the present invention, the light emitting layer 13 is sandwiched between two transparent electrodes, at least one of which is about 0.1 to A 0.15 μm light-emitting layer 13 and, if necessary, functional layers such as an electron injection layer, a hole injection layer, and a transport layer are provided, and a direct current of 5 to 20 V is applied. The light-emitting layer 13 includes a soluble π-conjugated polymer such as a polyparaphenylene vinylene derivative, a polythiophene derivative, a polydialkylfluorene, a polyparaphenylene derivative, a polyacetylene derivative, and a polyvinyl carbazole derivative (CMC, “Organic EL Material and Display”). ). These solutions can be provided by spin coating, inkjet printing, or the like, and the color is determined by the energy gap of each substance, and the larger the energy gap, the shorter the wavelength. The luminous body layer 13 and the upper and lower electrode layers are designed by examining the balance between electron and hole injection. Among the polymer types, the dye-dispersed type has a simple structure. Polyvinylcarbazole or polyphenylenevinylene is mixed with a hole transporting component such as an oxadiazole derivative or an electron transporting property such as a trishydroxyquinolylaluminum complex, and a layer in which a laser dye such as a coumarin derivative, quinacdrine, or rubrene is mixed as a dopant. It is sandwiched between electrodes. In addition, the σ-conjugated polymer such as polymethylphenylsilane has an emission peak in the near ultraviolet region and can emit visible light by mixing a laser dye such as butylbenzoxazolylthiophene or a benzopyranone derivative.
The LEC has a structure in which the light-emitting layer 13 is sandwiched between two electrodes, at least one of which is transparent, and has only a light-emitting layer 13 of about 15 μm. The light-emitting layer 13 has the same conjugated polymer and ethylene oxide as the organic EL, It is a mixture of a polymer or oligomer electrolyte material such as phosphazene and a metal salt such as lithium trifluoromethanesulfonate. When a DC voltage of 3 to 5 V is applied, the cations and anions of the salt electrochemically dope the conjugated polymer to produce P-type and N-type semiconductors in a well-balanced manner, and efficiently generate electrons or holes in the conjugated polymer. It will be supplied well, and will emit light in the same manner as the organic EL (WO96 / 00968).
Among the above three types of surface light emitters 4, inorganic EL is easy to control the film thickness and has stability against the environment, and LEC is simple in structure, has no limitation on electrode material, is easy to control the film thickness, and has low power consumption. This is preferred.
The base electrode 14 facing the transparent electrode 10 is made of a metal or alloy such as gold, silver, copper, nickel, aluminum, magnesium, calcium, lithium, palladium, platinum, or tungsten carbide, silicon carbide, tin oxide, indium oxide, or the like. The conductive ceramic or fullerene can be formed by photopolymerization, electron beam irradiation polymerization, plasma polymerization, electrolytic polymerization, or the like. When the light emitting layer 13 is an organic EL, a material having a large difference in work function from the transparent electrode 10 is selected. In addition to these fine particles, it can also be formed by a conductive ink in which a conductive filler such as carbon black and graphite is mixed with an insulating resin solution such as an epoxy resin, a urethane resin and a silicone resin.
As in the case of the transparent electrode 10, in order to suppress a change in resistance due to stretching, the above-mentioned conductive filler such as fine particles of conductive ceramics, carbon black, graphite, etc., is cured by low cross-linking such as epoxy resin, urethane resin and silicone resin. It is preferable to form the film by mixing with a hydrophilic resin or an organic polymer such as a thermoplastic resin having a large molecular weight such as polyamide, polyester, polyacryl, chlorinated polyolefin, unvulcanized synthetic rubber, and thermoplastic elastomer. Further, the base electrode 14 may be formed of the above-described conductive polymer instead of the organic polymer.
It is more preferable to use a conductive polymer, since the binder itself becomes conductive, so that conduction can be maintained even if the chain of the conductive filler is broken. Furthermore, it is preferable to mix conductive fibers or flexible carbon nanotubes, since the resistance can be reduced and maintained by the bypass effect.
Next, a method of manufacturing the member 1 for a push button switch according to the first embodiment will be described.
With the flat transparent insulating film 9 at the bottom, a band-shaped transparent electrode 10 is formed at a position where the key top portion 3 of the transparent insulating film 9 is located, the width being substantially equal to the width of the top surface of the key top portion 3. Then, by performing negative printing with opaque colored ink having a light-shielding property and an insulating property centering on a portion corresponding to the top surface portion of the key top portion 3 from above the transparent electrode 10, the back surface portion of the key top portion 3 is formed. An opaque colored layer 11 large enough to cover the removed outer peripheral surface is formed. At this time, in the place where the top surface part of the key top part 3 of the opaque colored layer 11 is located, a punching die part 12 in which the shape of the pattern part of the display part 2 displaying the switch function is formed is formed.
Next, a luminescent material is printed on the opaque colored layer 11 by printing a luminescent material to a size slightly smaller than the size of the top surface of the key top portion 3 including the punching die portion 12. As a result, the light emitting layer 13 is filled in the blanking die portion 12. Further, a base electrode 14 having substantially the same size as the light-emitting layer 13 is formed on the light-emitting layer 13 so that the light-emitting layer 13 stays in the blanking portion 12 of the opaque colored layer 11, thereby reducing the aperture. A printed sheet (not shown) before processing is completed.
As a light emitting material of the light emitting layer 13, a phosphor powder obtained by doping zinc sulfide with copper or the like may be used as a ferroelectric binder such as cyanoethyl cellulose, cyanoethyl saccharose, or cyanoethyl pullulan. Examples thereof include an ink dissolved in a polar solvent such as acetonitrile, and a toluene solution in which an electron transporting dye such as a trishydroxyquinolinolaluminum complex is mixed with a hole transporting binder such as polyvinyl carbazole.
The formation of the pattern portion, the ground portion, the opaque colored layer 11 and the like of the display portion 2 is performed by screen printing, ink jet printing, heat transfer printing, gravure printing, spray coating, dip coating, spin coating, vapor deposition, etc. of a normal transparent and opaque ink. What is necessary is just to perform using a technique. Further, the color of the printing substrate can be used as it is.
Next, the above-mentioned printed sheet before drawing is subjected to drawing according to the desired shape of the key top portion 3 by air pressure / vacuum forming, press forming, or the like, and is formed into a concave portion in which the key top body 16 is provided. Create a sheet. At this time, it is necessary to secure a sufficient roundness at the bent portion of the transparent electrode 10 so that the resistance values of the transparent electrode 10 and the base electrode 14 do not greatly change.
Next, a thermosetting resin is injected into the concave portion of the shaped sheet formed by drawing, and is cured in the mold. Thereafter, the movable contact 7 is formed by applying conductive ink to the tip of the pressing protrusion 8 of the key top portion 3, and the member for the push button switch according to the first embodiment is completed.
The formation of the ground portion, the colored layer, the luminous body layer 13 and the like uses ordinary screen printing, ink jet printing, thermal transfer printing, gravure printing, tampo printing, spray painting, dip coating, spin coating, vapor deposition and the like.
The transparent colored layer 15 and the opaque colored layer 11 are made of a soft resin or elastomer as a binder and mixed with a dye or a pigment. The transparent colored layer 15 and the opaque colored layer 11 are preferably in close contact with the transparent insulating film 9 and have the same stretchability. Is preferred. The thickness is 1 to 20 μm, but it is preferably 3 μm or more, which is easy to provide by printing or the like.
As the shaping of the key top shape, blow molding, vacuum molding, mold molding and the like, which are usually used, are employed. In order to eliminate the misregistration of the design of the display unit 2, it is preferable to mold the transparent insulating film 9 to a heat deformation temperature except for the place where the display unit 2 is provided. After maintaining the shape, and before depressurizing, cooling to obtain an accurate shape. The higher the stretching speed, the more easily the resistance value of the conductor increases. Therefore, the stretching speed is preferably 100 mm / min or less, more preferably 50 mm / min or less.
The material to be filled in the key top body 16 forming the plunger portion or the like is selected from hard or soft resin or elastomer. There is no limitation on thermoplasticity, thermosetting properties, pellet shape, liquid state, etc., but liquid thermosetting resins are preferable because they can be easily poured. This formation can be performed by injection molding, transfer molding, potting or the like, and it is also possible to provide a pre-molded product by bonding.
Next, various aspects of the display unit 2 will be described.
The display unit 2 includes a pattern portion such as a character, a code or a pattern, and its ground portion, and at least one of the portions emits light by itself, and the portion that emits light includes one of a pair of the transparent electrode 10 and the base electrode. The light-emitting body layer 13 is sandwiched between the light-emitting body layer 14 and the light-emitting body layer 14.
The characters, codes, patterns, and the like serving as the pattern portion of the display unit 2 can be provided by a normal printing method. Depending on the relationship with the background of the display unit 2, various types of transmitted light, self-luminous light, reflected light, and color differences are used. A design is devised.
FIG. 2 to FIG. 11 are cross-sectional views of main parts showing display units having different designs. 2 to 8 show patterns of the display unit in which characters, codes, designs, and the like emit light, and FIGS. 8 to 10 show patterns of the display unit in which the ground portion emits light.
In the first embodiment of the display unit 2 shown in FIG. 2, the transparent insulating film 9, the transparent electrode 10, the opaque colored layer 11 having the punched portion 12, and the luminescent layer filling the punched portion 12 are arranged in this order from the top. 13 and a base electrode 14, and has the same configuration as the first embodiment shown in FIG.
In the second embodiment of the display unit 2 shown in FIG. 3, the transparent insulating film 9, the opaque colored layer 11 constituting the ground portion having the die portion 12, and the pattern portion filling the die portion 12 are arranged in this order from the top. , A transparent colored layer 15, a transparent electrode 10, a light emitting layer 13 and a base electrode 14.
In the third mode of the display unit 2 shown in FIG. 4, the transparent insulating film 9 and the opaque colored layer 11 forming the ground portion having the punching portion 12 and the punching portion 12 are inserted in this order from the top. It has a colored transparent electrode 10a constituting a pattern portion, a luminescent layer 13 and a base electrode 14 which fill the blanking portion 12 via the colored transparent electrode 10a.
A fourth mode of the display unit 2 shown in FIG. 5 is that the transparent insulating film 9, the transparent electrode 10, and the opaque colored layer 11 and the die 12 Has a transparent colored layer 15, a luminescent layer 13 and a base electrode 14 which constitute a pattern portion for filling the pattern.
In the fifth mode of the display unit 2 shown in FIG. 6, the transparent overcoat layer 16 and the opaque colored layer 11 forming the ground portion having the punching portion 12 in order from the top (the punching portion 12 is overcoated) (Filled with a layer 16), a transparent colored layer 15, a transparent insulating film 9, a transparent electrode 10, a luminous body layer 13, and a base electrode 14 constituting a pattern portion.
In the sixth mode of the display unit 2 shown in FIG. 7, a transparent insulating film 9, a transparent electrode 10, an opaque colored layer 11 forming a pattern portion, a transparent colored layer 15 forming a ground portion, It has a luminous body layer 13 and a base electrode 14.
In the seventh embodiment of the display unit 2 shown in FIG. 8, a transparent insulating film 9, a transparent electrode 10, a color forming layer 13, a colored dielectric layer 18a, and a base electrode 14 constituting a pattern portion are arranged in this order from the top. Have.
An eighth embodiment of the display unit 2 shown in FIG. 9 is that, in order from the top, a transparent insulating film 9, a transparent electrode 10, an opaque colored layer 11 constituting a pattern portion, and a ground portion which covers the outer periphery of the opaque colored layer 11 , A light-emitting layer 13 and a base electrode 14.
The ninth mode of the display unit 2 shown in FIG. 10 is that, in order from the top, the transparent insulating film 9, the opaque colored layer 11 constituting the pattern portion, the transparent colored layer 15 constituting the ground portion, and the opaque colored layer 11 And a transparent coloring layer 15, a transparent electrode 10, a light emitting layer 13, and a base electrode 14 covering the outer periphery of the transparent coloring layer 15.
A tenth aspect of the display unit 2 shown in FIG. 11 is that, in order from the top, a transparent transparent insulating film 9, an opaque colored layer 11 constituting a pattern portion, and a transparent colored electrode 10a covering the outer periphery of the opaque colored layer 11 , A luminous body layer 13 and a base electrode 14.
Of these, the one shown in FIG. 4 and FIG. 11 is one in which the transparent electrode 10 is colored to form a transparent colored electrode 10a. The process is simplified and the manufacturing cost can be reduced.
In FIG. 8, since characters, codes, figures, and the like are formed by the luminous body layer 13, the printing of the opaque colored layer can be omitted, the number of times of printing is reduced, and the manufacturing process is simplified. Can be
The transparent coloring layer 15 and the opaque coloring layer 11 are made of a mixture of a soft resin or an elastomer as a binder and a dye or a pigment, and are preferably in close contact with the transparent insulating film 9 and also have stretchability. It is preferable to use a resin as in the case of the transparent insulating film 9.
[Embodiment 2]
The member for a push button switch of this embodiment is the same as that of the first embodiment except that a conductor connected to the transparent electrode and the base electrode is provided. The configuration near the top surface of the key top portion according to this embodiment will be described in detail with reference to FIG. 12 showing a layer configuration corresponding to the details of FIG.
Below the transparent insulating film 9, an opaque colored layer 11 as a concealing layer and a transparent colored layer 15 as the display unit 2 are provided. Next, in order to enhance the adhesion of the transparent electrode 10, an anchor coat 17 layer is provided. This anchor coat layer 17 can be omitted when the transparent coloring layer 15 has the same function. In order to keep the transparent electrode 10 from being unnecessarily large and keep insulation from the base electrode 14, it is important to form the transparent electrode 10 so as not to overlap with the conductor 14d connected to the base electrode 14. Since the light-emitting layer 13 and the dielectric layer 18b need to maintain the insulating property between the base electrode 14 and the transparent electrode 10, it is necessary to form the transparent electrode 10 in a portion where the transparent electrode 10 and the base electrode 14 overlap. . The base electrode 14 is covered with the insulating thin film layer 19. Thereby, the base electrode 14 and the transparent electrode 10 are kept insulative, and at the same time, when the formation of the base electrode 14 is extended, the flow of the material of the conductor 14d of the softened base electrode 14 is regulated. This serves to suppress a rise in the resistance value of the substrate.
A high dielectric substance such as barium titanate or potassium titanate may be further added to the binder of the dielectric layer 18b to increase the electric field efficiency. In order to insulate the transparent electrode 10 from the base electrode 14, the volume resistance and the film thickness of the dielectric layer 18b are important. A volume resistance of 13 or more is required when DC 100V is applied, and the film thickness must be at least 10 μm. . It is important to note that when the insulation property decreases, the light emission luminance decreases and the efficiency decreases. Of course, there should be no pinholes or foreign matter. When a high-concentration ink such as a non-solvent ink is used, a thick film is formed at a time, pinholes and the like due to evaporation of the solvent are reduced, and the insulating property is easily maintained.
The storage elastic modulus of the binder at the molding temperature must not be lower than that of the base material and the insulating thin film layer 19, and it is necessary that the binder be in a fluid state earlier and easily stretched. When the dynamic viscoelasticity is measured, the storage modulus is preferably one digit or less, more preferably two digits or less. When the size of the sample is not sufficient for measuring the dynamic viscoelasticity, the size can be determined while maintaining the sample at a required temperature using a microhardness tester.
The vicinity of the top surface of the key top portion 3 is not distorted by molding and is hardly stretched, but the portion of the key top side surface is stretched to the maximum. The overlapping portion of the transparent electrode 10 or the conductor 10d connected thereto and the base electrode 14 and the conductor 14d connected thereto is likely to be damaged or broken, and therefore must be avoided.
Further, in order to avoid an unexpected break or an increase in resistance value due to a variation in molding or the like, a plurality of switch circuits connected to each of the transparent electrode 10 and the base electrode 14 as a redundant circuit is very effective in light emission stability. preferable.
FIG. 13 is a plan view showing an example of a plurality of base electrodes used in a member for a push button switch according to Embodiment 2 of the present invention and patterns of conductors connected to the base electrodes.
The base electrodes 14 corresponding to the display portions 2 of the plurality of key top portions 3 have a substantially circular or elliptical shape having a size sufficient to cover the bottom surface side of the light emitting layer 13. , Two strip-shaped conductors 14d extend from each other, and these two conductors 14d are finally combined into one main trunk 14s via a path line 14k to form the push button switch member 1. It is designed to be connected to an electrode terminal.
FIG. 14 is a plan view showing an example of a pattern of a plurality of transparent electrodes used for a member for a push button switch according to Embodiment 2 of the present invention and conductors connected thereto.
The transparent electrodes 10 corresponding to the display portions 2 of the plurality of key top portions 3 have a substantially circular or elliptical shape having a size sufficient to cover the upper surface side of the light emitting layer 13. , Two strip-shaped conductors 10d extend from each other, and these two conductors 10d are finally combined into one main trunk 10s via a path line 10k to form the push button switch member 1. It is designed to be connected to an electrode terminal.
The drawing shows a case where the outer shape of the transparent electrode 10 is slightly larger than the outer shape of the base electrode 14. When the pattern of the transparent electrode 10 is superimposed on the pattern of the base electrode 14, the state shown in FIG. 15 is obtained. In other words, the base electrode 14 is covered with the transparent electrode 10 (in the case of a finished product, the light emitting layer 13 is interposed therebetween), but the conductor 14d extending from the base electrode 14 and the transparent electrode 10 extend therefrom. The outgoing conductor 10d is arranged so as not to overlap with each other, and so that the path line 14k and the main trunk 14s of the base electrode 14 do not overlap with the path line 10k and the main trunk 10s of the transparent electrode 10.
Accordingly, there is no possibility that the conductor 14d connected to the base electrode 14 and the conductor 10d connected to the transparent electrode 10 come into contact with each other, and there is no possibility of damage or breakage, so that stable illumination is guaranteed.
FIG. 16 is an enlarged sectional view showing the structure of the base electrode 14 more specifically in the same design as the display section shown in FIG.
As shown in FIG. 16, when the base electrode 14 is a conductive layer of a composite of the conductive polymer layer 20 and the conductive filler layer 21 composed of the organic polymer and the conductive filler, the conductive filler Even if the chain is broken, the conductive polymer layer 20 compensates for the continuity, which is more preferable.
The thickness of the base electrode 14 and the conductor 14d connected to the base electrode 14 is preferably three times or more, and more preferably five times or more, the size of the conductive filler thinned after molding. With the flow and deformation of the binder, the conductive filler also needs to move similarly, and the shape is preferably a granular shape close to a sphere.
In order to ensure the particle chain, fibrous or planar fillers are also selected. However, fibrous ones are very convenient because they are oriented with the flow and the resistance value is easily maintained. The aspect ratio of the fibrous conductive filler is 10 or more, preferably 20 or more, and more preferably 50 or more. The length is preferably 0.1 mm or less from the viewpoint of printability. Polyacrylonitrile-based carbon fibers or the like, torn, zinc oxide, ceramic whiskers such as potassium titanate, etc. are carbon-coated or silver-plated, etc., but flexible ones are good, acrylic, rayon, polyester, Examples thereof include silver-plated synthetic fibers such as phenol, and single-wall nanotubes and multi-wall nanotubes. The nanotube is a conductive fiber having a wire diameter of 0.2 μm or less, which is very convenient. The compounding amount is determined by a desired resistance value, but is 0.1 to 20 wt%.
Third Embodiment of the Invention
FIG. 17 shows a member for a push button switch according to Embodiment 3 of the present invention.
The member 1 for a push button switch according to the third embodiment shown in FIG. 17 has a display unit 2 of characters, codes, designs, or the like provided at an intermediate portion of the key top unit 3. It employs a surface light-emitting body 4 that emits light.
The push-button switch member 1 according to the second embodiment has a dome portion that can be elastically deformed so that the movable contact 7 is arranged at a position facing the fixed contact 6 in accordance with the arrangement of the fixed contact 6 on the circuit board 5. The contact sheet member 23 provided with the movable contact 7 on the inner surface of the contact sheet member 22, and the central portion of the dome portion 22 of the contact sheet member 23 can be pressed by the pressing projection 8 provided on the back surface of the key top portion 3. The key top part 3 is formed integrally.
Therefore, on the surface of the transparent insulating film 9, a first resin molded body 24 formed into a desired key top shape is provided integrally, and on the back surface of the transparent insulating film 9, a transparent electrode 10 is provided. Have been.
On the back surface of the transparent electrode 10, a transparent colored layer 15 is formed in which a pattern portion of the display unit 2 is formed with transparent colored ink at a position corresponding to the top surface of the key top unit 3. The display portion 2 is formed on a part of the top surface portion of the key top portion 3. On the back surface of the transparent coloring layer 15 and on the back surface of the transparent electrode 10 surrounding the transparent coloring layer 15, a luminous body layer 13 made of a luminescent material is provided. Is provided. Further, a base electrode 14 made of silver paste is provided on the back surface of the light emitting layer 13. On the back surface of the base electrode 14, a second resin molded body 25 having a pressing projection 8 provided at a position corresponding to the center of the back surface of the key top portion 3 is integrally formed.
Note that the materials of the respective members in the third embodiment are the same as those in the first embodiment, so the description of the first embodiment is referred to.
Next, a method for manufacturing the member for a push button switch 1 according to the third embodiment will be described.
First, a band-shaped transparent electrode 10 having a width substantially equal to the width of the top surface of the key top 3 is formed on the rear surface of the transparent insulating film 9 where the key top 3 is located. The pattern part of the display part 2 is formed. Next, a luminescent material is applied on the transparent electrode 10 and the display unit 2 on the back surface side of the key top 3 to form the luminescent layer 13. Next, an insulating ink having a light-shielding property and an insulating property is applied to the outer peripheral portion of the light-emitting layer 13 and the transparent electrode 10 except for a portion corresponding to the center of the back surface of the key top 3 of the light-emitting layer 13 to be opaque. The coloring layer 11 is formed. A base electrode 14 is printed on the light-emitting layer 13 as a counter electrode, and is kept in the printing area of the opaque colored layer 11. On the base electrode 14, the second resin molded body 25 and the pressing projection 8 at the center of the back surface thereof are integrally formed.
Next, the first resin molded body 24 previously formed in a desired key-top shape is adhered and fixed to the front surface of the corresponding position of the transparent insulating film 9 on which the second resin molded body 25 is formed. The member 1 is completed.
In the third embodiment, since the luminous body layer 13 is disposed between the first resin molded body 24 and the second resin molded body 25 and is provided at a position in the middle of the key top portion 3, the luminous body layer 13 emits light. Since the body layer 13 is kept in an environmental state that is isolated from the external atmosphere, it is not affected by moisture or oxygen, and the light emitting performance does not decrease even if it is used for a long time.
In the first and second embodiments, the display unit 2 is provided on the top surface of the key top unit 3, and in the third embodiment, the display unit 2 is provided in the middle of the key top unit 3. If it is integral with the key top portion 3 such as the top surface portion, the back surface portion, or the middle portion of the portion 3, the position is not limited, and may be determined according to the preference of the design.
Further, since the transparent electrode 10 is located on the transparent insulating film 9, the position in the key top portion 3 of the display unit 2 is generally located above the key top portion 3. Since the lifetime is affected by oxygen and oxygen, after forming the transparent insulating film 9 on which the display unit 2 is printed and applied, a molded body made of a transparent insulating resin is adhered on the upper portion or integrally formed by in-molding. When the display section 2 is formed at the center of the key top section 3, the infiltration of moisture and oxygen from the upper and lower portions can be equalized, which is an effective way to extend the life.
When an inorganic EL sheet was used as a conventional planar light source, the area of use was large. However, in the member for a push button switch according to the present invention, the luminescent layer was formed only on the display section of the key top section. Since it is provided, its use area is about 1/5 to 1/100 as compared with the conventional inorganic EL sheet system, and the power consumption can be greatly reduced in proportion thereto.
Example
Hereinafter, Examples 1 to 5 manufactured to evaluate the first to third embodiments and Comparative Examples 1 and 2 manufactured as comparative products thereof will be described.
[Preliminary test]
Hereinafter, a preliminary test performed to confirm the performance of the printed sheet before forming the member 1 for a push button switch according to the present invention will be described.
(Adjustment of thermoplastic binder)
Thermoplastic polyesters having a storage elastic modulus of 1 × 10E6 (Pa) and 5 × 10E8 (Pa) at 100 ° C. (manufactured by Toyobo, trade name: Byron) are each dissolved in cellosolve acetate so as to have a solid content of 50%. An insulating binder solution (the former was abbreviated as IL and the latter as IH) was prepared.
(Adjustment of silver paste)
A granular silver powder having an average particle size of 2.5 μm and 0.3 μm (Silcoat, trade name, manufactured by Fukuda Metal Foil Powder Industry Co., Ltd. and silver powder, manufactured by DMC Square Co., Ltd.) was added to IL at a volume resistance of 1 × 10E-3 to 5 ×. A desired amount was mixed and dispersed so as to be 10E-2 to obtain a silver paste (referred to as ILSL and ILSS, respectively). Similarly, IHSL and IHSS were obtained in addition to IH.
(Tensile test)
Ten types of samples were prepared using the four types of silver pastes prepared under the above conditions, and these silver pastes were printed on an amorphous polyethylene terephthalate sheet having a thickness of 50 μm. After drying, the insulating binder solution was further dried. Coated and covered with a 10 μm thick coating. This printed material was punched out into a dumbbell shape having a neck width of 2 mm, and a tensile test was performed in an atmosphere of 100 ° C. using Tensilon at a tensile speed of 100 mm / min, and the elongation and resistance to 200% were measured as needed. After the test, the thickness of the silver paste on the test piece was measured.
Tables 1 and 2 show the test results for the above 10 types of samples.
According to the results of the preliminary test, the samples 5 and 6 without the insulating coat have a larger resistance increase after the tensile test than those with the insulating coat. Further, in Samples 7 and 8 whose film thickness after the tensile test was less than three times the size of the conductive particles, the resistance was significantly increased.
[Example 1]
The first embodiment corresponds to the first embodiment of the present invention.
First, a poly (3,4-ethylenedioxythiophene) (denatron 4001, manufactured by Nagase Sangyo Co., Ltd.) solution in which 100 μm polymethyl methacrylate (acryprene, manufactured by Mitsubishi Rayon Co., Ltd.) is doped with sulfonated polystyrene on one side is used. Using a homogenizer, 3% of multiwall nanotubes (wire diameter 0.01 μm, average line length 5 μm, manufactured by Hyperion) were dispersed with respect to the solid content to obtain a transparent treatment liquid. Next, the treatment liquid was applied to one surface of the transparent insulating film 9 by a gravure coater to form a transparent electrode 10 having a thickness of 1 μm. This had a total light transmittance of 70% (measured according to JIS-K7105) and a surface resistance of 500Ω / □ (measured according to JIS-K6911).
The opaque colored layer 11 was applied to the entire surface of the display unit 2 with black color ink having shielding and insulating properties by screen printing except for the pattern portion and the second electrode terminal portion of the display unit 2. An inorganic EL paste in which zinc sulfide having a green emission color is dispersed in cyanoethylcellulose is printed on the base die 12 by printing a 20 μm phosphor layer 13, and then a barium titanate powder is dispersed in cyanoethylcellulose to 10 μm. Was provided. Finally, an opposing electrode and a terminal electrode connected to the opposing electrode were provided on the opaque colored layer 11 with a base electrode (Dodent NH-030A, thermoplastic polyamide binder, manufactured by Nihon Handa Co., Ltd.) 14 on the light emitting layer 13. After the printing process was completed, the film was sufficiently dried with a vacuum drying device to obtain a printed film.
A first mold having a diameter of 12 mm, a depth of 7.8 mm, a mold having 12 cavities having a concave curved surface with a bottom surface of R50 (mm), and an elastic body having a hardness of 90 ° (Shore A) molded by the mold. A metal piece having a diameter of 8 mm was placed on the pattern portion of the display unit 2 for heat insulation, heated to 110 ° C. by infrared rays, and immediately after the metal piece was removed, the printed film was cold-pressed. After removing the male mold, a required amount of liquid silicone rubber having a hardness of 80 ° (Shore A) is cast as the key top body 16, and the key top body is formed by the second male mold having the cross-sectional shape shown in FIG. The pressing projection 8 was formed on the rear surface of the substrate 16. The movable contact 7 was formed on the pressing projection 8 with silicone ink containing carbon black, and a member 1 for a push button switch (corresponding to the first embodiment) was obtained.
When the electrode terminals of the push button switch member 1 and the electrode terminals on the circuit board 5 are placed together and an AC voltage of 50 V and 100 Hz is applied to the light emitting layer 13, the display unit 2 emits green light, and the luminance is It was 5.2 nits.
[Comparative Example 1]
Comparative Example 1 is for evaluating Example 1.
Comparative Example 1 is the same as Example 1 except that the transparent electrode 10 is formed of ITO ink (manufactured by Sumitomo Osaka Cement Co., Ltd.) in which transparent ceramic particles are dispersed (no nanotubes).
When the member for the push button switch according to Comparative Example 1 was turned on, the light did not turn on at five places, and the remaining portions had different brightness, and it was difficult to determine that the light was turned on.
[Example 2]
Example 2 corresponds to Embodiment 1 of the present invention.
In Example 2, the same conductive polymer as in Example 1 was colored red as the transparent electrode 10. The luminous body layer 13 is made of white zinc sulfide.
First, a poly (3,4-ethylenedioxythiophene) (Denatron 4001, manufactured by Nagase Sangyo Co., Ltd.) solution in which 100 μm polymethyl methacrylate (Mitsubishi Rayon Co., Ltd., Acryprene) is doped with sulfonated polystyrene on one side is used. A dye consisting of a multi-walled nanotube (wire diameter: 0.01 μm, average line length: 5 μm, manufactured by Hyperion) and azo compound is added at 0.1% by weight based on the solid content, and dispersed using a homogenizer. A clear red treatment liquid was obtained. Next, the treatment liquid was applied to one surface of the transparent insulating film 9 by a gravure coater to form a red transparent electrode 10 having a thickness of 1 μm. Further, the non-colored conductive polymer solution was applied around the pattern portion of the display section 2 by screen printing.
Thereafter, the same processing as in Example 1 was performed to obtain a member 1 for a push button switch.
When the electrode terminals of the member 1 for a push button switch and the electrode terminals on the circuit board 5 are placed together and an AC of 50 V and 100 Hz is applied to the luminous body layer 13, all the display units 2 emit light, and the luminance is 6. It was 0 nits.
[Example 3]
Example 3 corresponds to Embodiment 2 of the present invention.
First, a poly (3,4-ethylenedioxythiophene) (denatron 4001, manufactured by Nagase Sangyo Co., Ltd.) solution in which 100 μm polymethyl methacrylate (acryprene, manufactured by Mitsubishi Rayon Co., Ltd.) is doped with sulfonated polystyrene on one side is used. Using a homogenizer, 3% of multi-wall nanotubes (manufactured by Hyperion Co., Ltd., wire diameter 0.01 μm, average wire length 5 μm) based on the solid content was dispersed to obtain a transparent treatment liquid.
Next, this treatment liquid was applied to one surface of the transparent insulating film 9 by a gravure coater to form a transparent electrode 10 having a thickness of 1 μm. This had a total light transmittance of 70% (measured according to JIS-K7105) and a surface resistance of 500 Ω / □ (measured according to JIS-K6911).
The opaque colored layer 11 was applied to the entire surface except for the display portion 2 and the second electrode terminal portion by screen printing using a concealing insulating black coloring ink on the ground portion of the display portion 2. An inorganic EL paste in which zinc sulfide having a green emission color is dispersed in cyanoethyl cellulose is similarly printed to a minimum of the opening in the ground to form a 20 μm phosphor layer 13, and then barium titanate powder is dispersed in cyanoethyl cellulose. The dielectric layer 18b having a thickness of 10 μm was provided. Finally, a terminal electrode composed of the base electrode 14 and a conductor 14d connected thereto was provided on the opaque colored layer 11 on the dielectric layer 18b with silver paste (ILSS). Printing was performed with the above-mentioned thermoplastic binder (IH) so as to cover the base electrode 14 and the conductor 14d connected thereto. After the printing process was completed, the film was sufficiently dried with a vacuum drying device to obtain a printed film.
Using a mold having 12 cavities having a concave surface with a diameter of 12 mm, a depth of 78 mm, and a bottom surface of 50 mmR, and a male mold made of an elastic body having a hardness of 90 ° (Shore A) molded by the mold, the display unit 2 is insulated. For this purpose, a metal piece having a diameter of 8 mm was placed, heated to 110 ° C. by infrared rays, and immediately after the metal piece was removed, the printed film was cold and compression-molded. After removing the male mold, a necessary amount of liquid silicone rubber having a hardness of 80 ° (Shore A) is cast as the key top main body 26, and the second male mold having the cross-sectional shape shown in FIG. Was molded. A contact portion was formed on the projection with silicone ink containing carbon black, and a member 1 for a push button switch having a plurality of key top portions 3 was obtained.
When the electrode terminals of the push button switch member 1 and the electrode terminals on the substrate are placed together and 50 V and 100 Hz are applied to the luminous body layer 13, all the display portions 2 of the plurality of key top portions 3 emit green light. With a luminance of 6.2 nits, sufficient brightness could be obtained.
[Example 4]
The fourth embodiment also corresponds to the second embodiment of the present invention, similarly to the third embodiment.
In Example 4, as the transparent electrode 10, the same conductive polymer as in Example 3 colored in red was used. The luminous body layer 13 is made of white zinc sulfide.
First, a poly (3,4-ethylenedioxythiophene) (denatron 4001, manufactured by Nagase Sangyo Co., Ltd.) solution in which 100 μm polymethyl methacrylate (acryprene, manufactured by Mitsubishi Rayon Co., Ltd.) is doped with sulfonated polystyrene on one side is used. 0.1% by weight of the solid content of a multi-wall nanotube (manufactured by Hyperion Co., Ltd., wire diameter 0.01 μm, average wire length 5 μm) and a dye composed of an azo compound was added at 0.1% by weight based on the solid content, and dispersed using a homogenizer. This gave a clear red processing solution.
Next, the treatment liquid was applied to one surface of the transparent insulating film 9 by a gravure coater to form a red transparent electrode having a thickness of 1 μm. Further, the uncolored conductive polymer solution was applied around the design pattern by screen printing. Thereafter, the process up to the dielectric layer 18b was performed in the same manner as in Example 1. Next, the base electrode 14 was formed of a conductive ink in which 20% of multi-wall nanotubes were mixed with the same conductive polymer as that of the transparent electrode 10, and a silver paste (ILSL) was printed thereon to a thickness of 10 μm. Thereafter, in the same manner as in Example 2, a member 1 for a push button switch having a plurality of key top portions was obtained.
When the electrode terminals of the push button switch member 1 and the electrode terminals on the substrate are placed together and 50 V, 100 Hz is applied to the luminous body layer 13, the display portions 2 of the plurality of key top portions 3 all emit light, With a brightness of 7.0 nits, sufficient brightness could be obtained.
[Example 5]
Example 5 corresponds to Embodiment 3 of the present invention.
In Example 5, a 15 μm ethylene-vinyl alcohol copolymer film was laminated on both sides of a 100 μm polypropylene film that had been subjected to a double-sided plasma treatment as the transparent insulator film 9. The ground portion of the display unit 2 was coated with green opaque colored ink by screen printing on the entire surface of the display unit 2 except for the pattern portion. Further, a dopant obtained by reacting benzenesulfonic acid with a sulfonated dendrimer (DAB (PA) 8) starting from cyanoethylene and a 1/6 mol of a sulfonated dendrimer of polyaniline structural unit (diaminobutane, manufactured by DSM). A pattern portion of the display section 2 and a terminal electrode connected to the pattern section were formed by ink jet printing using a ponianiline solution containing. Further, a conductive polymer ink mixed with silver powder (Silcoat, manufactured by Fukuda Metal Foil & Powder Co., Ltd.) having a solid content of 75% by weight of the polyaniline solution is coated so as to cover the polyaniline from the periphery of the pattern of the display unit 2 to the terminal. Was printed with a 5 μm formation layer. The total light transmittance of the transparent electrode 10 was 65% (measured according to JIS-K7105), and the surface resistance was 700Ω / □ (measured according to JIS-K6911).
A 15 μm-thick luminous layer covering the transparent electrode 10 by ink-jet printing similarly using an LEC ink composed of poly (p-phenylene-2,6-benzimidazole), polyethylene oxide and lithium toluenesulfonate. 13 was formed. Next, the base electrode 14 of the luminous body layer 13 and the electrode terminal connected thereto were formed with the silver mixed conductive polymer ink away from the formation layer. After the printing process was completed, the film was sufficiently dried with a vacuum drying device to obtain a printed film.
A female mold having 15 cavities with a flat bottom with a flat bottom of 3 mm x 5 mm and a depth of 1.5 mm and a convex part with a 2.8 mm x 4.8 mm, 0.9 mm height top flat. Using a male mold, place a 2.6 mm x 4.6 mm metal piece on the pattern part of the display unit 2 for heat insulation, heat to 100 ° C by infrared irradiation, remove the metal piece, and immediately cool the printed film And compression molded. After removing the male mold, a necessary amount of a liquid epoxy resin containing 10 wt% of iron as an oxygen removing agent is cast, and a second resin mold having the same sectional shape as that shown in FIG. The body 20 and the pressing projection 8 at the center of the back surface were formed.
Further, a first resin molded body 19 made of an acrylic resin and having a desired key top shape was adhered with a two-part acrylic adhesive. The electrode part of the obtained molded body was masked, dipped in a silanol solution using aminosilanol as a catalyst, dried at 40 ° C. and reacted to form a 2 μm-thick silica layer on the surface of the molded body. A switch member 1 (corresponding to the second embodiment) was obtained.
When the electrode terminals of the push button switch member 1 and the electrode terminals on the circuit board 5 are placed together and a direct current of 4 V is applied to the luminous body layer 13, all the display units 2 emit light, and the brightness is 6.5 nits. there were.
[Comparative Example 2]
Comparative Example 2 is for evaluating Example 5.
As Comparative Example 2, the same electrode as in Example 3 was manufactured except that the transparent electrode 10 was formed by ion sputtering of indium tin oxide.
When the member for the push button switch according to Comparative Example 2 was turned on, it did not turn on at all.
Industrial applicability
The present invention relates to a push button switch member having a display unit for displaying a switch function in an input device such as a mobile terminal such as a mobile phone, a PDA, a car stereo, an in-vehicle board computer, an audio device, a measuring instrument, and a personal computer. It is effectively used for an illuminated push-button switch member that can illuminate a display unit at a place.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part showing a member for a push button switch according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view of a main part showing a first mode (corresponding to the first embodiment) of the display section of the member for a push button switch according to the present invention.
FIG. 3 is a sectional view of a main part showing a second mode of the display unit.
FIG. 4 is a fragmentary cross-sectional view showing a third mode of the display unit.
FIG. 5 is a sectional view of a main part showing a fourth mode of the display unit.
FIG. 6 is a fragmentary cross-sectional view showing a fifth mode of the display unit.
FIG. 7 is an essential part cross-sectional view showing a sixth mode of the display unit.
FIG. 8 is a fragmentary cross-sectional view showing a seventh mode of the display unit.
FIG. 9 is a sectional view of an essential part showing an eighth mode of the display unit.
FIG. 10 is a sectional view showing a ninth aspect of the display unit.
FIG. 11 is a cross-sectional view of relevant parts showing a tenth aspect of the display unit.
FIG. 12 is an enlarged sectional view showing a main part of a member for a push button switch according to Embodiment 2 of the present invention and showing a configuration corresponding to the details of FIG.
FIG. 13 is a plan view showing a pattern of a member base electrode for the push button switch and a conductor connected thereto.
FIG. 14 is a plan view showing a transparent electrode of the member for a push button switch and a pattern of a conductor connected to the transparent electrode.
FIG. 15 is a plan view showing a state in which a transparent electrode and a conductor pattern connected thereto are superimposed on a base electrode of the push button switch member and a conductor pattern connected thereto.
FIG. 16 is an enlarged sectional view showing the structure of the base electrode more specifically in the same design as the display section shown in FIG.
FIG. 17 is a cross-sectional view of a main part showing a member for a push button switch according to Embodiment 3 of the present invention.
FIG. 18 is a sectional view of a main part of a member for a push button switch using an LED as a conventional light source.
FIG. 19 is a sectional view of a main part of a conventional member for a push button switch using a light bulb as a light source.
FIG. 20 is a sectional view of a main part of a member for a push button switch employing a conventional light guide member.
FIG. 21 is a sectional view of a main part of a member for a push button switch using an EL sheet as a conventional light source.

Claims (18)

  1. A key top portion for pressing a movable contact disposed opposite to the fixed contact on the circuit board in a direction in which the movable contact comes into contact with the fixed contact; and disposing the key top portion at a predetermined position on the circuit board. A member for a push button switch having a cover base material for mounting, and a surface light emitter integrated with a display unit for displaying a switch function on the key top part, wherein the surface light emitter is a base electrode and the base electrode. A member for a push button switch, comprising a luminescent layer between the transparent electrode and the transparent electrode facing the display, wherein the transparent electrode provided in contact with the display unit is a transparent conductive polymer.
  2. The member for a push button switch according to claim 1, wherein the transparent electrode has a surface resistance of 10Ω / □ or more and a light transmittance of 90% or less.
  3. The member for a push button switch according to claim 1 or 2, wherein the transparent electrode contains conductive fibers having a wire diameter of 0.5 µm or less and an aspect ratio of 20 or more.
  4. The member for a push button switch according to any one of claims 1 to 3, wherein the transparent electrode is colored.
  5. The member for a push button switch according to any one of claims 1 to 4, wherein the transparent conductive polymer is made of a derivative of any one of polypyrrole, polythiophene, and polyaniline.
  6. A stretchable conductor is continuous with the base electrode and the transparent electrode, and at least a stretched portion where a tensile force acts upon molding of the conductor is covered with a stretchable insulating thin film. The member for a push button switch according to any one of claims 1 to 5, wherein
  7. The member for a push button switch according to claim 6, wherein a conductor connected to the base electrode and a conductor connected to the transparent electrode are arranged so as not to overlap in a plan view.
  8. The storage elastic modulus at a molding temperature of the material of the insulating thin film at a molding temperature is larger than the storage elastic modulus at a molding temperature of a conductor connected to the base electrode and a conductor connected to the transparent electrode. Item 8. The member for a push button switch according to Item 7.
  9. The base electrode and the conductor connected to the base electrode include a conductive layer having an organic polymer and a conductive filler, and the length of at least one side of the conductive filler is substantially 1/3 or less of the thickness of the conductive layer. The member for a push button switch according to any one of claims 6 to 8, wherein:
  10. The member for a push button switch according to claim 9, wherein a conductive polymer layer is added to the conductive layer.
  11. The member for a push button switch according to claim 9 or 10, wherein the conductive filler is a fibrous material having a wire diameter of 1 µm or less.
  12. The member for a push button switch according to any one of claims 6 to 11, wherein the base electrode and a conductor connected to the base electrode are made of a conductive polymer.
  13. The key top portion has a key top body having a desired key top shape on the back surface of the base electrode, and a pressing projection for bringing the movable contact into contact with the fixed contact on the back surface of the key top body. The member for a push button switch according to any one of claims 1 to 12, wherein the member has a push button switch.
  14. The key top portion includes a transparent first resin molded body having a desired key top shape on a surface of the transparent electrode via a transparent insulating film, and a movable contact on the back surface of the base electrode and the fixed contact. The member for a push button switch according to any one of claims 1 to 12, further comprising: a second resin molded body having a pressing projection for contacting the second resin molded body.
  15. A plurality of key top portions and a plurality of switch circuits each including the base electrode and the transparent electrode corresponding to the plurality of key top portions are integrally formed on the cover base. Item 13. The member for a push button switch according to any one of Items 1 to 12.
  16. When forming a desired key top shape by drawing the transparent electrode formed on one surface of the transparent insulating film to form a desired key-top shape, at least the transparent electrode of the stretched portion where a tensile force acts at the time of drawing, the stretchability The method for manufacturing a member for a push button switch according to any one of claims 1 to 15, wherein a conductive polymer is used.
  17. 17. The method for manufacturing a member for a push button switch according to claim 16, wherein at least an extending portion of the transparent electrode before drawing is formed to be thick.
  18. A transparent electrode is formed at a position corresponding to the key top portion on one surface of a transparent insulating film covering the outer surface of the key top portion, a light emitting layer is formed on the transparent electrode, and a base electrode is formed on the light emitting layer. Forming a conductive sheet having stretchability connected to the base electrode and the transparent electrode to form a printed sheet before drawing, and drawing the printed sheet to obtain a desired key top shape. Forming a part of the conductor to which a tensile force is applied at the time of drawing processing, wherein a part of the conductor is coated with a stretchable insulating thin film. Item 16. The method for manufacturing a member for a push button switch according to any one of items 15.
JP2003500928A 2001-05-25 2002-04-23 Member for push button switch and method of manufacturing the same Granted JPWO2002097837A1 (en)

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US6984799B2 (en) 2006-01-10
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CN1463458A (en) 2003-12-24
CN100437860C (en) 2008-11-26
US20040129542A1 (en) 2004-07-08
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US6936783B2 (en) 2005-08-30
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